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Evolution of the low-frequency pulse profile of PSR B2217+47

Published online by Cambridge University Press:  04 June 2018

D. Michilli ,
J. W. T. Hessels ,
J. Y. Donner ,
J.-M. Grießmeier ,
M. Serylak ,
B. Shaw ,
B. W. Stappers ,
J. P. W. Verbiest ,
A. T. Deller  and
L. N. Driessen
...Show all authors
D. Michilli
Affiliation:
Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA, Dwingeloo, The Netherlands
J. W. T. Hessels
Affiliation:
Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA, Dwingeloo, The Netherlands
J. Y. Donner
Affiliation:
Fakultät für Physik, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany
J.-M. Grießmeier
Affiliation:
LPC2E - Université d’Orléans / CNRS, 45071 Orléans cedex 2, France Station de Radioastronomie de Nançay, Observatoire de Paris, PSL Research University, CNRS, Univ. Orléans, OSUC, 18330 Nançay, France
M. Serylak
Affiliation:
Department of Physics & Astronomy, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa SKA South Africa, 3rd Floor, The Park, Park Road, Pinelands, 7405, South Africa
B. Shaw
Affiliation:
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
B. W. Stappers
Affiliation:
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
J. P. W. Verbiest
Affiliation:
Fakultät für Physik, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
A. T. Deller
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia
L. N. Driessen
Affiliation:
Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
D. R. Stinebring
Affiliation:
Dept. of Physics and Astronomy, Oberlin College, 110 North Professor St., Oberlin, OH 44074, USA
L. Bondonneau
Affiliation:
LPC2E - Université d’Orléans / CNRS, 45071 Orléans cedex 2, France
M. Geyer
Affiliation:
Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
M. Hoeft
Affiliation:
Thüringer Landessternwarte Tautenburg, Sternwarte 7, 07778 Tautenburg, Germany
A. Karastergiou
Affiliation:
Department of Physics & Astronomy, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa
M. Kramer
Affiliation:
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
S. Osłowski
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia
M. Pilia
Affiliation:
ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA, Dwingeloo, The Netherlands INAF - Osservatorio Astronomico di Cagliari, via della Scienza 5, 09047 Selargius (Cagliari), Italy email: danielemichilli@gmail.com
S. Sanidas
Affiliation:
Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
P. Weltevrede
Affiliation:
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
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Abstract

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An evolution of the low-frequency pulse profile of PSR B2217+47 is observed during a six-year observing campaign with the LOFAR telescope at 150 MHz. The evolution is manifested as a new component in the profile trailing the main peak. The leading part of the profile, including a newly-observed weak component, is steady during the campaign. The transient component is not visible in simultaneous observations at 1500 MHz using the Lovell telescope, implying a chromatic effect. A variation in the dispersion measure of the source is detected in the same timespan. Precession of the pulsar and changes in the magnetosphere are investigated to explain the profile evolution. However, the listed properties favour a model based on turbulence in the interstellar medium (ISM). This interpretation is confirmed by a strong correlation between the intensity of the transient component and main peak in single pulses. Since PSR B2217+47 is the fourth brightest pulsar visible to LOFAR, we speculate that ISM-induced pulse profile evolution might be relatively common but subtle and that SKA-Low will detect many similar examples. In this scenario, similar studies of pulse profile evolution could be used in parallel with scintillation arcs to characterize the properties of the ISM.

Keywords

pulsars: individual: PSR B2217+47–ISM: general–radio continuum: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S337: Pulsar Astrophysics the Next Fifty Years , September 2017 , pp. 291 - 294
Copyright
Copyright © International Astronomical Union 2018 

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